[Drbd-dev] PATCH: Missing state change netlink events

Philipp Reisner philipp.reisner at linbit.com
Mon Nov 5 11:25:22 CET 2007

On Sunday 04 November 2007 22:46:47 Graham, Simon wrote:
>  <<ava-3834.patch>> We have noticed that not all state changes are being
> reported via netlink (as seen with the 'drbdsetup /dev/drbd0 events -a
> -u' command) - the reason for this is that the state broadcast is done
> in after_state_ch using the _current_ mdev state when it runs - it's
> entirely possible for two state changes to occur in quick succession
> before the after_state_ch worker runs which results in the same state
> being broadcast twice - this is especially a problem if you are looking
> to see disk Failed state changes as the state tends to change to Failed
> and then to Diskless very quickly, which can result in the Diskless
> state being reported twice.
> I think the fix is simple - modify the code so that after_state_ch
> broadcasts the new state rather than the current state (patch attached)
> - I would have removed the passing of mdev completely from
> drbd_bcast_state() if it weren't for the fact it is required by the
> generated to_tags function. I'm testing this at the moment but it's a
> little hard to be sure it's right since this requires fairly tight
> timing.

Hi Simon,

You are right. Obviously.
I have put it into GIT.

: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
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